Emotional Amanda Knox Tells 'GMA,' 'I Will Never Go Willingly' (Video)

Amanda Knox GMA - H 2014

The U.S. student, convicted of murder on Thursday by an Italian appeals court three years after she was freed from prison, was defiant but held back tears in an exclusive interview with "Good Morning America."

An emotional Amanda Knox appeared on the verge of tears as she spoke to Good Morning America's Robin Roberts following a murder conviction that could send her to prison for more than 28 years.

Knox appeared on GMA a day after an Italian appeals court reinstated her conviction for the 2007 murder of her British roommate. The U.S. student, who published a memoir last year, was sentenced to 28 1/2 years in prison along with her ex-boyfriend Raffaele Sollecito.

While Knox, who appeared in person in the ABC morning show's Times Square studio, would need to be extradited to Italy in order to be imprisoned, her lawyers first plan to appeal the decision to the Italian supreme court.

STORY: 'Good Morning America' Lands Exclusive Amanda Knox Interview

Knox told Roberts she was stunned by the verdict, which she watched on an Italian TV station online, feeling like she couldn't wait for her lawyer to relay the decision to her, she had to hear it for herself.

"I couldn't believe what I was hearing," she said, adding that she's gone through waves of emotion about the outcome.

"My first reaction was 'No' and 'This is wrong,' and I'm going to do everything I can to prove that it is. And I felt very determined and my family felt very determined. But it was only on my way here that I had my first cry," she explained.

Knox, who frequently had to pause to collect herself during the interview and whose voice was quavering, said that she was surprised and disappointed in the verdict.

STORY: Amanda Knox's Murder Conviction Reinstated on Appeal

"This really has hit me like a train," she said. "I did not expect this to happen. I really expected so better from the Italian justice system. They found me innocent before. How can they say it's guilt beyond a reasonable doubt?"

"I'm going to fight this until the very end," Knox added, remaining defiant. "And it's not right, and it's not fair. And I'm going to do everything I can," she said.

With respect to returning to prison -- which Knox has said she would have to be dragged kicking and screaming back to -- she said, "I will never go willingly…"

Knox also argued that the Italian justice system may have produced an unfair verdict.

"I really hope that people try to understand that when you have overzealous prosecutors and when you have a biased interrogator and a biased investigation and coercive interrogations, these things happen, and I'm not crazy," she said.

Knox also offered support for her ex-boyfriend Sollecito, who also was found guilty of murder and sentenced to 28 1/2 years in prison. "I don't know what I would do if they imprisoned him. It is maddening," she said.

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